deep pockets vs plural

deep pockets and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
deep pockets	Yes	No	No	No
plural	Yes	Yes	No	No

deep pockets (noun)	plural (noun)
(plural) a source of substantial wealth	the form of a word that is used to denote more than one

deep pockets (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind